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Compression test and oil wt question.

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Britcheflee

08-26-2007 03:57:32




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Reading a number of posts here about doing compression test dry then wet - when you do the compression test 'wet' do you just add regular 30wt oil in there or something higher? And how much?

I am not that motivated at the moment to pull the head and do the sleeves rings rebuild as my father in law is coming back from Canada where they spend the summer and I want to impress him by having the 8N going after all those years stuck in the mud by the barn.

In the meantime I was going to go up to a heavier weight oil from the 30w I have in at the moment. If I went up as high as 50w or more it is not going to cause any other problems? Should I go for a straight 50wt or one of those 20w-50. I get good oil pressure 40 at start and about 20 at idle or a tad less when hot.

I am located in N CA where most of the summer it is hot and winters are not as harsh as in other areas. 'Global warming' has made the new snow blower my father in law bought some 5 years ago defunct!!! Although he has old movies of the snow up to the top of the fence posts!!!

Lee

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TXMarko

08-26-2007 08:13:24




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 Re: Compression test and oil wt question. in reply to Britcheflee, 08-26-2007 03:57:32  
I would be willing to bet the first winter after you sell or trade your snow blower attachment, the snow will once again get to the tops of the fenceposts!



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old

08-26-2007 07:46:08




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 Re: Compression test and oil wt question. in reply to Britcheflee, 08-26-2007 03:57:32  
Well if it has been parked for years you might try this first. Fill the cylinders with tranny fluid and let it sit a few days. Then with the plugs out spin the engine over to clear the cylinders of the tranny fluid. Then change the oil and use a stright weight oil like 40W or 50W. What the tranny fluid will do is help free up any of the rings that might be stuck and if it has stuck rings that will cause it to smoke like you said its doing. Stuck rings are common for an engine that hasn't been run in a long time and does work some times. As far as a compression test you only need about a table spoon of oil in the cylinders to do the test. Also you need to have the trottle wide open and all the plugs out to get a good test

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